Iron(III) sulfide, also known as ferric sulfide or sesquisulfide, is one of the three iron sulfides besides FeS and FeS2. It is a solid, black powder but decays at ambient temperature into a yellow-green powder.
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|Molar mass||207.90 g/mol |
|Density||4.3 g/cm3 |
|Melting point||decomposition |
|very slightly soluble |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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This is a relatively unstable artificial product that does not occur in nature.
Preparation and propertiesEdit
- 2 FeCl3 + 3 Na2S → Fe2S3↓ + 6 NaCl
3(s) + H
2O(l) + 3 H
2S(g) → Fe
3(s) + 6 H
- Fe2S3 → 2 FeS + S↓
With hydrochloric acid it decays according to the following reaction equation:
- Fe2S3 + 4 HCl → 2 FeCl2 + 2 H2S↑ + S↓